Resin formulation containing dye and use thereof as a high purity marker pen

Abstract

A marker pen is provided with a barrel, a nose cone connected to the barrel and terminating in a tip, the barrel and nose cone collectively defining a volume that holds a marker resin formulation contained within the volume, the resin formulation includes a polymer, a solvent in which the polymer is dissolved or dispersed, and an organic dye of Solvent Blue 5; with the proviso that the formulation has a chloride content of less than 100 ppm, a total metal content of less than 300 ppm, and a sulfur content of less than 250 ppm or alternatively, a thickener is present and retains the purity at a viscosity of at least 10,000 centipoise. A process of marking a surface includes applying a continuous bead of the formulation to a surface.

1 . A marker pen comprising:
 a barrel;   a nose cone connected to the barrel and terminating in a tip, the barrel and nose cone collectively defining a volume;   a marker formulation contained within the volume and comprising:
 a resin; 
 a solvent in which said resin is dissolved or dispersed; 
 an organic dye of Solvent Blue 5; 
   with the proviso that the formulation has a chloride content of less than 100 ppm, a total metal content of less than 300 ppm, and a sulfur content of less than 250 ppm.   
     
     
         2 . The marker pen of  claim 1  further comprising a bladder within the volume, the formulation within the bladder. 
     
     
         3 . The marker pen of  claim 1  wherein the tip a steel roller ball or a porous polymeric nib. 
     
     
         4 . The marker pen of  claim 1  wherein said solvent is a majority by solvent weight percentage C 3 -C 8  ketones. 
     
     
         5 . The formulation of  claim 1  wherein said thickener is present in an amount sufficient to yield a viscosity of a 3,000 to 12,000 centipoise for the formulation. 
     
     
         6 . The formulation of  claim 1  further comprising at least one additive of: a siccative, an anti-skinning agent, and a wetting agent. 
     
     
         7 . The marker pen of  claim 1  wherein the Solvent Blue 5 is present in an amount of 1 to 10 total weight percent and the color is strong blue. 
     
     
         8 . A marker pen comprising:
 a barrel;   a nose cone connected to the barrel and terminating in a tip, the barrel and nose cone collectively defining a volume;   a marker formulation contained within the volume and comprising:
 a resin; 
 a solvent in which said resin is dissolved or dispersed; 
 an organic dye; and 
 a thickener; 
   with the proviso that the formulation has a viscosity of at least 10,000 centipoise, chloride content of less than 450 ppm, a total metal content of less than 200 ppm, and a sulfur content of less than 630 ppm.   
     
     
         9 . The marker pen of  claim 8  further comprising titanium dioxide and the is present. 
     
     
         10 . The marker pen of  claim 8  wherein the organic dye is a red, blue, or yellow as perceived by a normal human eye. 
     
     
         11 . The marker pen of  claim 8  further comprising a rheological additive. 
     
     
         12 . The marker pen of  claim 11  wherein the rheological additive is a modified castor oil. 
     
     
         13 . The marker pen of  claim 8  further comprising a kaolin-based thickener, a montmorillonite-based thickener, or a combination thereof. 
     
     
         14 . The marker pen of  claim 13  wherein the montmorillonite-based thickener alone is present. 
     
     
         15 . The marker pen of  claim 13  wherein the kaolin-based thickener alone is present. 
     
     
         16 . The marker pen of  claim 8  wherein the organic dye is Solvent Blue 5. 
     
     
         17 . The marker pen of  claim 16  wherein Solvent Blue 5 is present in an amount of 1 to 10 total weight percent and the color is strong blue. 
     
     
         18 . A process of marking a surface comprising:
 applying the formulation of  claim 8  from the marker pen to a surface as a continuous bead; and   drying the formulation to a state of dry-to-touch to mark the surface.   
     
     
         19 . The process of  claim 18  wherein said applying of the formulation is as a bead having a width of 3.2±1 millimeters. 
     
     
         20 . The process of  claim 18  wherein said drying occurs to full hardness in 24 hours under standard temperature and pressure.